Physics 102-001, Spring 2012 (Howard)
DUE DATE: 8 March 2012
Homework #2
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Chapter 7 Energy
1) If you push an object twice as far while applying the same force, you do
A) twice as much work.
B) four times as much work.
C) the same amount of work.
D) half as much work.
2) If you push an object a given distance, while applying twice the force, you do
A) twice as much work.
B) four times as much work.
C) the same amount of work.
D) half as much work.
3) A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of
A) energy.
B) power.
C) effort.
D) none of these
Chapter 8 Rotational Motion
4) If a turntable's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will
A) double.
B) halve.
C) remain the same.
5) The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is
A) above a place of support.
B) relatively low for such a tall building.
C) stabilized by its structure.
D) displaced from its center.
E) in the same place as its center of mass.

Chapter 9 Gravity
6) When the distance between two stars decreases by half, the force between them
A) decreases by one-quarter.
B) decreases by one-half.
C) increases to twice as much.
D) increases to four times as much.
E) stays the same.
7) The reason the moon does not crash into the Earth is that the
A) Earth's gravitational field is weak at the moon.
B) gravitational pull of other planets keeps the moon up.
C) moon has a sufficient tangential speed.
D) moon has less mass than the Earth.
E) none of these
Chapter 10 Projectile and Satellite Motion
8) A bullet fired horizontally from a rifle begins to fall
A) as soon as it leaves the barrel.
B) after air friction reduces its speed.
C) neither of these
9) An Earth satellite is simply a projectile
A) freely falling around the Earth.
B) floating motionless in space near the Earth.
C) approaching the Earth from outer space.
Chapter 11 Atomic Nature of Matter
10) Which of these atoms has the most mass?
A) hydrogen
B) iron
C) lead
D) uranium
E) All have the same mass.

11) What makes an element distinct?
A) the number of protons
B) the number of neutrons
C) the number of electrons
D) the total mass of all the particles
E) none of these
Chapter 12 Solids
12) Which has the greater density, a lake full of water or a cup full of lake water?
A) the cup full of lake water
B) the lake full of lake water
C) Both have the same density.
D) It is impossible to tell without knowing the size of the lake.
13) If the volume of an object were to double while its mass stays the same, its density would
A) halve.
B) double.
C) stay the same.
D) become four times as great.
Chapter 13 Liquids
14) The pressure at the bottom of a jug filled with water does NOT depend on
A) the acceleration due to gravity.
B) water density.
C) the height of the liquid.
D) surface area of the water.
E) none of these
15) A completely submerged object always displaces its own
A) volume of fluid.
B) weight of fluid.
C) density of fluid.
D) all of these
E) none of these

Chapter 14 Gases and Plasmas
16) A one-ton blimp hovers in the air. The buoyant force acting on it is
A) zero.
B) one ton.
C) less than one ton.
D) more than one ton.
17) Airplane flight best illustrates
A) Archimedes' principle.
B) Pascal's principle.
C) Bernoulli's principle.
D) Boyle's law.
Chapter 15 Temperature, Heat, and Expansion
18) A substance that heats up relatively quickly has a
A) high specific heat.
B) low specific heat.
C) high conductivity.
D) low conductivity.
19) When an iron ring is heated, the hole becomes
A) smaller.
B) larger.
C) neither smaller nor larger.
D) either smaller or larger, depending on the ring thickness.
Chapter 16 Heat Transfer
20) Substances absorb heat energy by the process of
A) conduction.
B) convection.
C) radiation.
D) all of these